Answer
$0$
Work Step by Step
Plugging in $x=\frac{\pi}{3}$ we get: $2\cos(3\frac{\pi}{3}-\frac{\pi}{2})=2\cos(\pi-\frac{\pi}{2})=2\cos(\frac{\pi}{2})=2\cdot0=0$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 3 - Test - Page 172: 18
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